Re: [Boost-users] [serialization] Purify shows "Free memory read" in~basic_binary_iprimitive

From: Robert Ramey (ramey_at_[hidden])
Date: 2007-07-06 11:49:20

Wouldn't this be an issue to be addressed in the "i/o state saver" library?

Robert Ramey

Markus Bernhardt wrote:
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> Hi,
>
> I'm using purify to check my app.
> Using serialization, I see the following FMR:
>
> #################
>
> FMR: Free memory read
>   This is occurring while in thread 3:
>   std::locale::~locale() [libstlport.so.1]
>   boost::scoped_ptr<std::locale>::~scoped_ptr()
>   boost::archive::basic_binary_iprimitive<boost::archive::
>     binary_iarchive,std::basic_istream
>     <char,std::char_traits<char> > >::~basic_binary_iprimitive()
>   boost::archive::binary_iarchive_impl
>     <boost::archive::binary_iarchive>::~binary_iarchive_impl()
>
>   boost::archive::binary_iarchive::~binary_iarchive()
>   void de::scmb::bm::seri::Serializer::serialize
>     (std::basic_ifstream<char,std::char_traits<char> >&,
>     de::scmb::bm::core::Instance&)
>
> Reading 8 bytes from 0x100312228 in the heap.
> Address 0x100312228 is at the beginning of a freed block of 80 bytes.
>
> This block was allocated from thread 3:
>   malloc         [rtlib.o]
>   c2n6Fl_Pv___1  [libCrun.so.1]
>   void*operator new(unsigned long) [rtlib.o]
>   std::locale::locale(std::_Locale_impl*,bool) [libstlport.so.1]
>   std::locale::locale<boost::archive::codecvt_null<char> >
>     (const std::locale&,__type_0*) [libboost_serialization-sw-d.a]
>   std::locale*boost::archive::add_facet
>     <boost::archive::codecvt_null<char> >(const
>     std::locale&,__type_0*) [libboost_serialization-sw-d.a]
>
> There have been 0 frees since this block was freed from thread 3:
>   free           [rtlib.o]
>   c2k6FPv_v___1  [libCrun.so.1]
>   void operator delete(void*) [rtlib.o]
>   boost::io::basic_ios_locale_saver
>     <char,std::char_traits<char> >::~basic_ios_locale_saver()
>     [libboost_serialization-sw-d.a]
>   boost::archive::basic_binary_iprimitive
>     <boost::archive::binary_iarchive,std::basic_istream
>       <char,std::char_traits<char> > >::~basic_binary_iprimitive()
>     [libboost_serialization-sw-d.a]
>   boost::archive::binary_iarchive_impl
>     <boost::archive::binary_iarchive>::~binary_iarchive_impl()
>     [Serializer.cpp]
>
> #################
>
> Has anyone seen this before.
>
> Looks like std::locale is using a buffer with 80 bytes size, which is
> shared between std::locale objetcs and get deleted by the destruction
> of a basic_ios_locale_saver object, which has a std::locale object.
>
> Is this guess correct ??
>
> Can this become a problem ??
>
> Kind regards,
> Markus
>
> - --
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> Markus Bernhardt GmbH
> Spieljochstr. 34
> 81825 München
>
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